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Low Sound Velocity Contributing to the High Thermoelectric Performance of Ag8SnSe6
Open accessAbstract
Conventional strategies for advancing thermoelectrics by minimizing the lattice thermal conductivity focus on phonon scattering for a short mean free path. Here, a design of slow phonon propagation as an effective approach for high‐performance thermoelectrics is shown. Taking Ag 8 SnSe 6 as an example, which shows one of the lowest sound velocities among known thermoelectric semiconductors, the lattice thermal conductivity is found to be as low as 0.2 W m−1 K−1 in the entire temperature range. As a result, a peak thermoelectric figure of merit zT > 1.2 and an average zT as high as ≈0.8 are achieved in Nb‐doped materials, without relying on a high thermoelectric power factor. This work demonstrates not only a guiding principle of low sound velocity for minimal lattice thermal conductivity and therefore high zT, but also argyrodite compounds as promising thermoelectric materials with weak chemical bonds and heavy constituent elements.
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Cited by
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Metadata
- Authors
- Li, W., Lin, S., Ge, B., Yang, J., Zhang, W., & Pei, Y.
- Venue
- Advanced Science
- Publisher
- Wiley
- Published
- 2016-07-07
- Volume
- 3
- Issue
- 11
- Pages
- 1600196-1600196
- ISSN
- 2198-3844 (ISSN-L)
- OpenAlex
- W2471120438
- Cited by
- 284
- References
- 34
- FWCI
- 13.82
- Type
- journal article
- Language
- en
- Open access
- gold
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